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介绍了我国铁路货车车钩、钩尾框概况,无损检测技术在我国铁路货车车钩、钩尾框应用历程,以及国内外无损检测技术在车钩、钩尾框的应用情况,并对无损检测技术的应用提出了建议。 相似文献
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To implement the primary signal without interference in cognitive radio systems, cognitive radios can detect the presence
of the primary user in low SNR. Currently, energy detector is the most common way of spectrum sensing because of its low computational
complexity. However, performance of the method will be possibly degraded due to the uncertainty noise. This paper illustrates
the benefits of one-order and two-order cyclostationary properties of primary user’s signals in time domain. These feature
detection techniques in time domain possess the advantages of simple structure and low computational complexity comparing
with spectral feature detection methods. Furthermore, performance of the one-order and two-order feature detection is studied
and the analytical results are given. Our analysis and numerical results show that the sensing performance of the one-order
feature detection is improved significantly comparing with conventional energy detector since it is robust to noise. Meanwhile,
numerical results show that the two-order feature detection technique is better than the one-order feature detection. However,
this benefit comes at the cost of hardware burdens and power consumption due to the additional multiplying algorithm. 相似文献
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介绍了我国铁路货车车钩量值传递管理体系的基本情况,分析了现有车钩实物量值传递的局限性,提出了构建以数字化基准钩为溯源源头的车钩量值传递体系的可行性,并给出了车钩数字化量值传递体系总体框架。 相似文献
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增加单车载重,扩大列车编组和提高机车牵引能力都会导致纵向力的增加及纵向冲动的加剧,为此在大秦铁路重载货车上研制开发RFC型牵引杆,来消除车钩间的连挂间隙.介绍了RFC牵引杆的结构与特点,并经过计算分析及试验验证该牵引杆符合技术条件要求.另外还讲述了牵引杆的运用及推广情况及取得的明显经济效益. 相似文献
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